Dynamo-electric machine.



W. D. PO'MEROY;

DYNAMQ ELECTRIC MAGHINE. ARPLIGATION TILED JULY 21, 1906.

922,946. Patented May 25,1909.

- INVENTOR WITNESSES Wi llliqfn D. Pomeroy AT TORNE Y WILLIAM D.POMEROY, OF NORWOOD, OHIO, ASSIGNOR TO CORPORATION OF NEW JERSEY, PANY,A CORPORATION OF OHIO ALLIS-CHALMERS COMPANY, A

AND THE BULLOCK ELECTRIC MANUFACTURING GOM- DYNAMO-ELECTRIC MACHINE.-

Specification of Letters Patent.

Patented May 25, 1909.

Application filed July 27, 1906. Serial No. 327,974. I

of which the following is a full, clear, and ex act specification.

My invention relates to dynamo-electric l machines and particularly tothe construction of the rotary element.

e The object of my invention is to provide a construction of the rotaryelement which is particularly adapted for high speeds, such as therotary field member of a turbo-alternator, and in which all partsparticularly the field coils are held firmly in position, and are wellventilated.

struction, and in the combinations and vvarrangements of parts describedin the specification and set i'orth in the appended claims.

For a better understanding of my invention, reference is hadto theaccompanying drawings in which Figure 1 is a partial elevation of therotary field member of a turbo-alternator; Fig. 2 is an end yiew'of thesame, parts being in section and broken away; Fig. 3 is an" enlarged 3elevation of a. portion of, the expansiblc ring employed in my improvedconstruction; and Fig. 4 is'a plan view of the same.

Referring now to the figures of the drawing-,-.I have shown at 10 arotary shaft on which is mounted a cylindrical core 11.,

shown merely in outline for the sake of clearness. The core 11 isprovided with field coils, theend-turns of which are shown at 12 inFigse 1- and 2; The end-turns of the iield coils are spaced apart andare preferably held from each other and from the core by insulatingblocks 13, mounted on insulating strips 13 as is shown in U. S. patentto Dunker 790,485, May 23, 1905. This type of-spacing, memberperrnits agood circulation of air between the end-turns. Surrounding the end-turnsof the coils at each end of the rotor is a rigid ring 14 made preferablyfrom a steel casting. The purpose of this ring is to prevent theend-turns'from being displaced or distorted'by centrifugal force at highspeeds of rotation. The ring is preferably provided with ventilatingopenings I i rections from the center, My lnvention consists in'thedetails of con- Located within the end-turns and engag mg inner surfacesthereof, so as to act as a support, is an inner expansible ring 16 alsopre erably made from a steel casting. Referring particularly to F 4 inwhich a detail of the inner ring is shown, it is seen that the ring isprovided with a large number oi transverse cuts or slots 17 extendinginward alternately from opposite sides, which slots extend almostentirely across the ring. These slots serve a two-fold purpose, the moreimportant oi. which is to render the ring 16 expansible, as will beexplained. A

further purpose of the slots is to render possible a good circulation ofairaround the endturns. In this instance the inner surface of the ring16 is inclined outwardly in both dias is shown at 18 and 19 in Fig. 1. 1

Located on the shaft 10 are two expanding rings 20 and 21, which areprovided with inclined outer surfaces, which "engage the inclinedsurfaces 18 and 19 on the inner surface or" the ring 16. Extendingthrough the rings 20 and ,21 are a plurality of adjusting bolts 2 bymeans of which the rings can be moved toward or away from each otheralong the shaft to enlarge or decrease the diameter of the innerexpansible ring 16, and thus to regulate'the pressure of the end-turnsoi the coils against the outer ring 14. The rings may be provided withaxial air passages as shown at 23, to permit a good circulation of air.

At 24 is shown an end plate for noteeting the coils and other parts, andfor holding in position the outer ring 14 which is preferably notched asshown at 25 to receive the outer edge of the plate 2%. The plate 2-1 isin this case provided with a number of openings 26 for the admission ofair into the machine. The end-plate 24, in this case, is held in position by a nut 27 which engages atlireaded portion 28Yof the shaft. i

Thus it is seen that I have provided a structure which is suitable forvery high s eeds. The construction is simple and consists of few partswhich are held firmly in position and are well protected. Furthermorethere is a good circulation ofairat each end ofthe machine axiallythrough the end-,1-

plate 24, .through the rings 20,21 and 16, around the end-turns, andout; through the outer ring 14. Also if desired thecore may be providedwith air passageways through which air may be drawn.

I do not wish to be confined to the exact details shown and describedbut-aim. in my claims to'cover all modifications which do not involve adeparture fromthespirit and scgp e of my invention.

rounding the end turns, anendless expansible ring within the end turnsand in engagement withthe latter, and means engaging the inner surfa eof said endless expansible ring, and serving to expand the same so as toforce the end turns outward against the outer ring.

2. chine, a core, coils carried thereby andhaving end turns n'ojectingbeyondthe ends thereof, a rigi ring surrounding the end turns, anendless expansible ring within the end turns and in engagement with thelatter, said ring having an inclined inner surface, and means comprisinga third ring engaging the inclined surface of the expansible ring forexpanding the latter so as to force the end turns outward-against theouter ring. I l

3. In a rotor of a dynamo-electric machine, a core, coils carriedthereby, said. coils having end turns projecting belyondthe core, arigid ring surrounding the endturns, an endless .expansible ring withinthe end-turns and in engagement with the latter, said ring having aninclined inner sprface, and means for expanding said endless expansiblering comprising a movable expanding -ring in one integral piece'andengaging the inclined surface of the expansible ring. r

4. In the rotor of a dynamo-electric machine a shaft, a core, coilscarried by the core, said coils having end turns pro ecting beyond 7 thelatter, a rigid ring surrounding the end turns, an endless expansiblering within the end turns and in engagement with the same, said ringhaving an inclined inner surface, and means for expanding said ringcomprising'an expanding ring engaging the shaft and the inclined surfaceof said expansible ring, and a plurality of bolts for shiftingsaid-expanding ring. v 1 5. In a rotor of a dynamo-electric machine,acore, coils carried thereby, said coils having end-turns projectingbeyond the core at one end thereof, a rigid supporting ring surroundingthe end-turns, an endless expansible rin within the endturns,"the innerI surface of said ring being inclined or beveled intwo' op -ositedirect-ions, a pair of 'expand- 1 ing rmgs avmg inclined faces engagingthe 2 inner surface of said expanslblc ring and-i means for moving saidair of rings to expand the ring on which t icy bear.

In the-rotor of a dynamo-electric ma 6, In a rotor of a dynamo-electricmahaving end-turns projecting beyond the core, a rigid supporting ringin one integral piece surrounding the end-turns, an endless expansiblesupporting ring within the end-turns,

other to expand t 1e inner supporting ring to force the end-turnsoutward against the outer ring. 1 7. In the rotor of adynaino-clectricma chine, a core, coils carried thereby, said coils having end turnsprojecting beyond the core, 'a'rigid ring surroundim the end turns, anexpansible ring within file end turns and in engagement \viththe latter,said expansible ring being in one integral piece and having an innersurface inclined in o-p 'iosite directions, and means for expanding sa dexpansible ring comprising two expanding rings engaging the inclinedportions of the'expansible ring, and bolts extending between saidexpanding rings for shifting the same.

. 8. In a rotor of a dynamo-electric mahaving end-turns projectingbeyond the core at one end thereof, a rlgid supporting ring pansiblering within the end-turns, said expansible' ring having its innersurface inclined outward on both sides of its center, a pair ofexpanding rings resting on the shaft and having outer inclined surfacesin engagement with the inclined portions of the --inner surface of theexpansible ring, and means for moving, said pair of expanding pressureof tho end-turns on the outer ring.

9. In a dynamo-electric machine, a core, coils'carried thereby, saidcoils having endturns projecting beyond the ends of the core, a-ringsurrounding the end-turns, a second ring within the end-turns, saidsecond ring having openings or slots cut in both sides whereby it may beex )all'ded, and means for expanding-said serom ring.

10. In a'rotor, a core, coils carried there'- by, said coils havingend-turns projecting beyond the ends of the core, a ring surrounding theend-turns, and an 'cxpansiblc ring within the end-turns, said ringhaving transverse cuts or slots extending inward from op-,' positesides.

11. In a rotor, a core, coils carried therei by, said coilshavingend-turns projecting bethe end-turns, said ring having ventilatingopenings, and a second ring within the end- .f turns, said last namedring having transl verse slots or cuts extcndim inward from chine, acore, coils carried thereby, said coils the inner surface .of said ringbeing inclined chine, a core, coils carried thereby, said coils.

surrounding the end turns,v an endless exrings axially along the s raftto adjust the yond the ends of thecore, a ring surrounding oppositesides whereby it can be expanded inward from opposite sides, and havingan inclined inner surface, and means on theshaft and engaging theinclined surface of the inner ring for expanding said ring, said meanspermitting a circulation of air through the said inner ring and aroundthe end-turns of the coils.

13. In rotor of a dynamo-electric machine, a shaft, a core, coilscarried thereby, said coils having end-turns or projections, a rigidring surrounding the end-turns, said ring having ventilating openings,airinner ring within the end-turns, said ring having an inclined innersurface and having transverse cuts or slots extending inward fromopposite sides, expanding rings located on the shaft and having inclinedsurfaces in engagement with the inclined. inner surface of said innerring,said expanding rings having ventilating openings, and means formoving said expanding rings axially, to adjust the diameter of saidinner ring.

14. In a rotor of a dynamo-electric machine, a shaft, :1 core, coilscarried thereby, said coils having end-turns projecting beyond the core,a rigid ring surrounding the end turns, an inner ring within the endturns, said ring having its inner surface inclined or beveled inopposite directions and having overlapping transverse cuts or slotsextending inward from opposite sides, a pair of expending rings locatedon the shaft and having inclined or beveled surfaces in engagement withthe oppositely inclined or beveled inner surface of said inner ring, andmeans for shifting said expanding rings so as to force the coils outwardagainst the outer ring. g

In testimony whereof 1 affix my signature, in the presence of twowitnesses.

VILLIAM D. POMEROY. Witnesses:

ARTHUR F. Kwis, FRED J. KiNsEY.

